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#include <iostream>
struct G
{
G(int &var) : var(var) {}
void operator()(int j) const {
var = j;
}
int &var;
};
int
main()
{
int i = 5;
G g(i);
/*
auto g = [&](int j)
{
i = j;
};
*/
std::cout << "i = " << i << std::endl;
g(42);
std::cout << "i = " << i << std::endl;
}
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